<?xml version="1.0" encoding="UTF-8"?>
<xbrl 
xmlns="http://www.xbrl.org/2003/instance" 
xmlns:concept="http://xbrl.org/formula/conformance/example" 
xmlns:link="http://www.xbrl.org/2003/linkbase" 
xmlns:xlink="http://www.w3.org/1999/xlink" 
>
  
  <link:schemaRef 
    xlink:type="simple" 
    xlink:href="uncovered-aspect-tests.xsd"/>

  <link:linkbaseRef 
    xlink:type="simple" 
    xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" 
    xlink:href="period-uncovered-formula1.xml"/>
  
  <context id="context1">
    <entity>
      <identifier scheme="http://xbrl.org/entity/identification/scheme">01</identifier>
    </entity>
    <period>
      <instant>2007-12-31</instant>
    </period>
  </context>
  
  <context id="context2">
    <entity>
      <identifier scheme="http://xbrl.org/entity/identification/scheme">01</identifier>
    </entity>
    <period>
      <instant>2008-01-01</instant>
    </period>
  </context>

  <context id="context3">
    <entity>
      <identifier scheme="http://xbrl.org/entity/identification/scheme">01</identifier>
    </entity>
    <period>
      <instant>2008-01-02</instant>
    </period>
  </context>

  <unit id="unit">
    <measure>pure</measure>
  </unit>
  
  <concept:n1 contextRef="context1" unitRef="unit" decimals="0">1</concept:n1>
  <concept:n1 contextRef="context2" unitRef="unit" decimals="0">2</concept:n1>
  <concept:n1 contextRef="context3" unitRef="unit" decimals="0">3</concept:n1>
  
</xbrl>